Assume x is a 3D array with n pages, representing students in a class, for each student (page in the array, the 3rd dimension), their grades are reported in two columns: Total Grade & Percent Grade. The rows of the student's page represent Math, Physics, Chemistry, and Biology in that order.
Write a function that extracts a student's Percent Grade in Physics given the student's number (n)
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Replace NaNs with the number that appears to its left in the row.
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